What is the primary physiological effect of excessive exposure to blue light emitted by digital screens?

The primary physiological effect of excessive exposure to blue light emitted by digital screens is the suppression of melatonin production, which disrupts the body's natural sleep-wake cycle, also known as the circadian rhythm. Blue light, a high-energy visible light, is naturally present in sunlight and helps regulate alertness and wakefulness. However, digital screens emit a significant amount of blue light. When the eyes are exposed to this light, especially in the evening or at night, it signals the brain to inhibit the release of melatonin, a hormone that promotes sleepiness. Reduced melatonin levels make it harder to fall asleep and can lead to poor sleep quality. Chronic disruption of the circadian rhythm can have various negative health consequences, including insomnia, increased risk of mood disorders, and metabolic problems. Therefore, limiting blue light exposure from digital screens before bedtime is often recommended to promote healthy sleep patterns. This can be achieved through blue light filtering glasses or software that reduces blue light emission from screens.